Patents by Inventor David C. Campen

David C. Campen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dewatering of solid residues of carbonaceous materials
    Patent number: 4323365
    Abstract: Process for removal of water from a mixture of water and certain solid residues of carbonaceous material, such as a coal char-water slurry, which comprises mixing the slurry with an acid, preferably hydrochloric acid, a surfactant, preferably water-immiscible such as lecithin, and an organic compound such as a liquid hydrocarbon, e.g. mineral spirits, causing the char to agglomerate, and thereby facilitating separation of the char from the mixture, as by screening, and filtering or centrifuging.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: April 6, 1982
    Assignee: Occidental Research Corporation
    Inventors: Alan C. Crosby, David C. Campen